Gearbox on 2:1 ratio is also used, for now its just direct drive. Very efficient, however the boat rolls far too much, over time the spray rails have been rubbed down, they need renewing to improve stability, straight line speed is very good!. Boat was originally made by my Uncle in the early 1960's (Motor: Turnigy T600 880KV) (ESC: Turnigy 60amp) (8/10)